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peg.g
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# -*- fundamental -*-
equals = "=" space ;
blank = [\t ] ;
eol = ("\n" "\r"*) | ("\r" "\n"*) ;
comment = "#" (!eol .)* ;
space = (blank | eol | comment)* ;
bar = "|" space ;
pling = "!" space ;
ampersand = "&" space ;
colon = ":" space ;
arrow = "->" space ;
quotesgl = "\'" space ;
backquote = "`" space ;
commaat = ",@" space ;
comma = "," space ;
dollarhash = "$#" space ;
dollardbl = "$$" space ;
dollar = "$" space ;
at = "@" space ;
query = "?" space ;
minus = "-" space ;
plus = "+" space ;
star = "*" space ;
lparen = "(" space ;
rparen = ")" space ;
lbrace = "{" space ;
rbrace = "}" space ;
dot = "." space ;
digit = [0-9] ;
higit = [0-9A-Fa-f] ;
number = ("-"? digit+) @$#:n space -> n ;
letter = [A-Z_a-z] ;
idpart = (letter (letter | digit)*) @$$ ;
identifier = idpart:id space -> id ;
char = "\\" ( "t" -> 9
| "n" -> 10
| "r" -> 13
| "x" (higit higit) @$#16
| "u" (higit higit higit higit) @$#16
| .
)
| . ;
string = "\"" (!"\"" char)* $:s "\"" space -> s ;
class = "[" (!"]" char)* $:s "]" space -> s ;
grammar = symbol:name space plus
definition*:rules space -> `(grammar-extend ,name ,@rules)
| symbol:name space colon symbol:parent space
(lparen identifier*:fields rparen)?
definition*:rules space -> `(grammar-define ,name ,parent ,fields ,@rules)
| definition*:d space expression?:e -> `(grammar-eval ,d ,(car e))
;
symfirst = [-!#$%&*+/:<=>@A-Z^_a-z|~] ;
symrest = [-!#$%&*+./:0-9<=>?@A-Z^_a-z|~] ;
symbol = (symfirst symrest*) @$$ ;
sinteger = "0x"(higit+) @$#16
| (digit+) @$#
;
sexpr = "-" sinteger:i -> (- i)
| sinteger
| symbol
| "?".
| "\"" (!"\"" char)* $:e "\"" -> e
| "(" sexpression*:e (space dot sexpression:f)? sspace ")" -> (set-list-source `(,@e ,@f) e)
| "[" sexpression*:e (space dot sexpression:f)? sspace "]" -> (set-list-source `(bracket ,@e ,@f) e)
| "'" sexpression:e -> (list 'quote e)
| "`" sexpression:e -> (list 'quasiquote e)
| ",@" sexpression:e -> (list 'unquote-splicing e)
| "," sexpression:e -> (list 'unquote e)
| "{" space grammar:e ( "}" -> e
| -> (error "error in grammar near: "(parser-stream-context self.source))
)
| ";" (![\n\r] .)*
;
scomment = ";" (!eol .)* ;
sspace = (blank | eol | scomment)* ;
sexpression = sspace sexpr ;
llist = lparen expression:e rparen -> e ;
atom = lparen expression:e rparen -> e
| quotesgl sexpression:e space -> `(match-object ,e)
| string:e -> `(match-string ,e)
| class:e -> `(match-class ,e)
| idpart:p "-" identifier:e -> `(match-rule-in ,p ,e)
| identifier:e -> `(match-rule ,e)
| lbrace sexpression*:e space rbrace -> `(match-rule ,@e)
| dot -> `(match-any)
| arrow sexpression:e space -> `(result-expr ,e)
| backquote llist:e -> `(match-list ,e)
;
repetition = atom :e ( query -> `(match-zero-one ,e) :e
| star -> `(match-zero-more ,e) :e
| plus -> `(match-one-more ,e) :e
)? -> e ;
conversion = repetition :e ( at -> `(make-span ,e) :e
| dollarhash ( number:n -> `(make-number ,n ,e) :e
| -> `(make-number 10 ,e) :e
)
| dollardbl -> `(make-symbol ,e ) :e
| dollar -> `(make-string ,e ) :e
| colon identifier :i -> `(assign-result ,i ,e ) :e
)* -> e ;
predicate = pling conversion:e -> `(peek-not ,e)
| ampersand ( arrow sexpression:e space -> `(peek-expr ,e)
| conversion:e -> `(peek-for ,e)
)
| conversion ;
sequence = predicate:p ( predicate+:q -> `(match-all ,p ,@q)
| -> p
) ;
expression = sequence:s ( (bar sequence)+:t -> `(match-first ,s ,@t)
| -> s
) ;
parameters = (colon identifier)* ;
definition = space identifier:id parameters:p
equals expression:e ";" -> `(,id ,e ,p) ;
definitions = definition* ;
start = (parser_class | definitions):result
;
varname = symbol:s space -> s ;
parser_decl = space varname:name colon varname:parent lparen (varname*):vars rparen -> `(,name ,parent ,vars) ;
parser_class = parser_decl:decl
definition*:definitions
space (!. | -> (error "error in grammar near: "(parser-stream-context self.source))
)
{gen_cola_parser (car decl) (cadr decl) (caddr decl) definitions}
;
parser_spec = parser_decl?:decl definition*:defns -> `(,decl ,@defns) ;
#----------------------------------------------------------------
gen_cola_parser = .:name .:parent .:vars .:definitions -> (set (<peg>-grammar-name self) name)
{gen_cola definitions}:definitions -> `((define-class ,name ,parent ,vars) ,@definitions) ;
gen_cola = &gen_cola_value_declarations:a
&gen_cola_effect_declarations:b
&gen_cola_value_definitions:c
gen_cola_effect_definitions:d -> `( ,@a ,@b ,@c ,@d ) ;
gen_cola_value_declarations = `( gen_cola_value_declaration* :d ) -> d ;
gen_cola_effect_declarations = `( gen_cola_effect_declaration*:d ) -> d ;
gen_cola_value_declaration = `( .:id ) -> `(define-selector ,(concat-symbol '$ id)) ;
gen_cola_effect_declaration = `( .:id ) -> `(define-selector ,(concat-symbol '$$ id)) ;
gen_cola_value_definitions = `( gen_cola_value_definition* :d ) -> d ;
gen_cola_effect_definitions = `( gen_cola_effect_definition*:d ) -> d ;
gen_cola_value_definition = `( .:id &{findvars ()}:vars value:exp ) -> `(peg-define-rule ,(concat-symbol '$ id) ,(<peg>-grammar-name self) ,vars ,exp) ;
gen_cola_effect_definition = `( .:id &{findvars ()}:vars effect:exp ) -> `(peg-define-rule ,(concat-symbol '$$ id) ,(<peg>-grammar-name self) ,vars ,exp) ;
findvars = .:vars `( 'assign-result .:name {findvars vars}:vars -> (if (assq name vars) vars (cons (cons name) vars))
| 'result-expr -> vars
| . ({findvars vars}:vars)* -> vars
| -> vars
) ;
value =
`( 'match-rule .:name .+:args -> `(let ((pos (<parser-stream>-position self.source)))
,@(map (lambda (arg) (list 'parser-stream-push 'self.source arg)) args)
(or (peg-match-rule ,(concat-symbol '$ name) self)
(let () (set (<parser-stream>-position self.source) pos) ())))
| 'match-rule .:name -> `(peg-match-rule ,(concat-symbol '$ name) self)
| 'match-rule-in .:type .:name .+:args -> `(let ((pos (<parser-stream>-position self.source))
(_p (parser ,(concat-symbol '< (concat-symbol type '>)) self.source)))
,@(map (lambda (arg) (list 'parser-stream-push 'self.source arg)) args)
(if (peg-match-rule ,(concat-symbol '$ name) _p)
(let () (set self.result (<parser>-result _p)) 1)
(let () (set (<parser-stream>-position self.source) pos) ())))
| 'match-rule-in .:type .:name -> `(let ((_p (parser ,(concat-symbol '< (concat-symbol type '>)) self.source)))
(and (peg-match-rule ,(concat-symbol '$ name) _p)
(let () (set self.result (<parser>-result _p)) 1)))
| 'match-first value+:exps -> `(or ,@exps)
| 'match-all (&(..) effect)*:e value:v -> `(let ((pos (<parser-stream>-position self.source)))
(or (and ,@e ,v) (let () (set (<parser-stream>-position self.source) pos) ())))
| 'match-zero-one value:exp -> `(let ((_list_ (group)))
(and ,exp (group-append _list_ self.result))
(set self.result (group->list! _list_))
1)
| 'match-zero-more value:exp -> `(let ((_list_ (group)))
(while ,exp (group-append _list_ self.result))
(set self.result (group->list! _list_))
1)
| 'match-one-more value:exp -> `(let ((_list_ (group)))
(while ,exp (group-append _list_ self.result))
(and (not (group-empty? _list_))
(let ()
(set self.result (group->list! _list_))
1)))
| 'peek-for value:exp -> `(let ((pos (<parser-stream>-position self.source)))
(and ,exp (set (<parser-stream>-position self.source) pos)))
| 'peek-expr .:exp -> exp
| 'peek-not value:exp -> `(not (let ((pos (<parser-stream>-position self.source)))
(and ,exp (set (<parser-stream>-position self.source) pos))))
| 'match-list value:exp -> `(and (pair? (parser-stream-peek self.source))
(let ((src self.source))
(set self.source (parser-stream (list-stream (parser-stream-peek src))))
(let ((ok ,exp))
(set self.source src)
(and ok (parser-stream-next src)))))
| 'match-class .:str -> `(set self.result (parser-stream-match-class self.source ,(make-class str)))
| 'match-string .:str -> `(set self.result (parser-stream-match-string self.source ,str))
| 'match-object .:obj -> `(and (= ',obj (parser-stream-peek self.source))
(set self.result (parser-stream-next self.source)))
| 'match-any -> '(and (!= *end* (parser-stream-peek self.source))
(let () (set self.result (parser-stream-next self.source)) 1))
| 'make-span effect:exp -> `(let ((pos (<parser-stream>-position self.source)))
(and ,exp
(let ()
(set self.result (list-from-to pos (<parser-stream>-position self.source)))
1)))
| 'make-string value:exp -> `(and ,exp (set self.result (list->string self.result)))
| 'make-symbol value:exp -> `(and ,exp (set self.result (string->symbol (list->string self.result))))
| 'make-number .:r value:exp -> `(and ,exp (set self.result (string->number-base (list->string self.result) ,r)))
| 'assign-result .:name value:exp -> `(and ,exp (let () (set ,name self.result) 1))
| 'result-expr .:exp -> `(let () (peg-source-range-begin self) (set self.result ,exp) (peg-source-range-end self) 1)
| .:op -> (error "cannot generate value for "op)
| -> (error "cannot generate value for nil")
) ;
effect =
`( 'match-rule .:name .+:args -> `(let ((pos (<parser-stream>-position self.source)))
,@(map (lambda (arg) (list 'parser-stream-push 'self.source arg)) args)
(or (peg-match-rule ,(concat-symbol '$$ name) self)
(let () (set (<parser-stream>-position self.source) pos) ())))
| 'match-rule .:name -> `(peg-match-rule ,(concat-symbol '$$ name) self)
| 'match-rule-in .:type .:name .+:args -> `(let ((pos (<parser-stream>-position self.source)))
(let ()
,@(map (lambda (arg) (list 'parser-stream-push 'self.source arg)) args)
(or (peg-match-rule ,(concat-symbol '$$ name)
(parser ,(concat-symbol '< (concat-symbol type '>)) self.source))
(let () (set (<parser-stream>-position self.source) pos) ()))))
| 'match-rule-in .:type .:name -> `(peg-match-rule ,(concat-symbol '$$ name)
(parser ,(concat-symbol '< (concat-symbol type '>)) self.source))
| 'match-first effect+:exps -> `(or ,@exps)
| 'match-all effect*:e -> `(let ((pos (<parser-stream>-position self.source)))
(or (and ,@e) (let () (set (<parser-stream>-position self.source) pos) ())))
| 'match-zero-one effect:exp -> `(let () ,exp 1)
| 'match-zero-more effect:exp -> `(let () (while ,exp) 1)
| 'match-one-more effect:exp -> `(and ,exp (let () (while ,exp) 1))
| 'peek-for effect:exp -> `(let ((pos (<parser-stream>-position self.source)))
(and ,exp (set (<parser-stream>-position self.source) pos)))
| 'peek-expr .:exp -> exp
| 'peek-not effect:exp -> `(not (let ((pos (<parser-stream>-position self.source)))
(and ,exp (set (<parser-stream>-position self.source) pos))))
| 'match-list effect:exp -> `(and (pair? (parser-stream-peek self.source))
(let ((src self.source))
(set self.source (parser-stream (list-stream (parser-stream-peek src))))
(let ((ok ,exp))
(set self.source src)
(and ok (parser-stream-next src)))))
| 'match-class .:str -> `(parser-stream-match-class self.source ,(make-class str))
| 'match-string .:str -> `(parser-stream-match-string self.source ,str)
| 'match-object .:obj -> `(parser-stream-match-object self.source ',obj)
| 'match-any -> '(parser-stream-match-any self.source)
| 'make-span effect:exp -> exp
| 'make-string effect:exp -> exp
| 'make-symbol effect:exp -> exp
| 'make-number .:r effect:exp -> exp
| 'assign-result .:name value:exp -> `(and ,exp (let () (set ,name self.result) 1))
| 'result-expr .:exp -> `(let () (peg-source-range-begin self) ,exp (peg-source-range-end self) 1)
| .:op -> (error "cannot generate value for "op)
| -> (error "cannot generate value for nil")
) ;